/*
 * @Author: 李超越 1509572300@qq.com
 * @Date: 2024-08-28 12:35:06
 * @LastEditors: 李超越 1509572300@qq.com
 * @LastEditTime: 2024-08-28 19:31:33
 * @FilePath: /my_git/lesson30_PV_ringqueue/RingQueue.hpp
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 */
#pragma once

#include "Thread.hpp"


template <typename T>
class RingQueue
{
public:
    RingQueue(int cap):_cap(cap),_ring_queue(cap),_productor_step(0),_consumer_step(0)
    {
        sem_init(&_room_sem, 0, _cap);
        sem_init(&_data_sem, 0, 0);
        pthread_mutex_init(&_productor_mutex, nullptr);
        pthread_mutex_init(&_consumer_mutex, nullptr);
    }

    void Enqueue(const T& in)
    {
        // 生产行为
        P(_room_sem);
        Lock(_productor_mutex);
        _ring_queue[_productor_step++] = in; // 生产
        _productor_step %= _cap;
        UnLock(_productor_mutex);
        V(_data_sem);
    }

    void Pop(T* out)
    {
        // 消费行为
        P(_data_sem);
        Lock(_consumer_mutex);
        *out = _ring_queue[_consumer_step++];
        _consumer_step %= _cap;
        UnLock(_consumer_mutex);
        V(_room_sem);
    }

    ~RingQueue()
    {
        sem_destroy(&_room_sem);
        sem_destroy(&_data_sem);
        pthread_mutex_destroy(&_productor_mutex);
        pthread_mutex_destroy(&_consumer_mutex);
    }

private:
    //环形队列
    vector<T> _ring_queue;
    int _cap;

    //生产消费的下标
    int _productor_step;
    int _consumer_step;

    //信号量
    sem_t _room_sem;//生产者关心
    sem_t _data_sem;//消费者关心

    //生产锁和消费锁
    pthread_mutex_t _productor_mutex;
    pthread_mutex_t _consumer_mutex;

    void P(sem_t &sem)
    {
        sem_wait(&sem);
    }

    void V(sem_t &sem)
    {
        sem_post(&sem);
    }

    void Lock(pthread_mutex_t &mutex)
    {
        pthread_mutex_lock(&mutex);
    }

    void UnLock(pthread_mutex_t &mutex)
    {
        pthread_mutex_unlock(&mutex);
    }
};